U.S. territories, Marshall Islands, Federal States of Micronesia. Learn more.

U.S. military and diplomatic posts, and the United Nations, NY. Learn more.

What are Commercial Plus rates?

Priority Mail rates are based on parcel weight, dimensions or packaging, and distance, as well as rate class.

When a custom package is used, parcel weight and dimensions are used to determine postage costs. Costs increase as weight and dimensions increases. Learn how dimensions affect rates.

Postage costs also increase as the distance increases. USPS uses Zones to measure the distance a domestic shipment must travel, ranging from Zone 1 (local) to Zone 9 (very far away). Learn more about Zones.

In contrast, Flat Rate services require specially marked boxes and envelopes that receive one rate, regardless of distance or weight. In most cases, Flat Rate packages are the lowest cost option, if items fit within the box. USPS provides packaging at no cost. Learn more.

On the other hand, Regional Rate service is a combination of ‘flat rate’ with Zones. It requires using specially marked boxes. It can be a very cost effective method if items fit within the box. Learn more.